Pressure-controlling means for hydraulic pumps.



Y J. w. NELSON.

PRESSURE CONTROLLING MEANS FOR HYDRAULIG PUMPS.

APPLIOATIOH FILED JAN. 20, 1908.

9 1 4, 1 64;. Patented Mar. 2, 1909.

2 SHEETS-SHEET 1.

J. W. NELSON.

PRESSURE CONTROLLING MEANS FOR HYDRAULIC PUMPS.

APPLICATION FILED JAN.20, 1908.

Patented Mar. 2, 1909.

2 SHEETS-SHEET 2.

Mm SN 7441M avwewfo-z JAMES W. NELSON, OF NEW YORK, N. Y. I

'PBEBBURE-OOHTBOLLING MEANS IOB HYDRAULIC PUIPB.

Specification of Letters Patent.

2 Patented Hatch 2,1909.

Application filed January 20, 1908. Serial No. 411,618.

To all whom it may concern:

Be it known that I, JAMES W. NELSON, a citizen of the United States, and resident of New York city, borough ofBrooklyn, county of Kings, and State of New York, have in-' vented certain new and useful Improvements in Pressure-Controlling Means for Hydraulic Pumps, of which the following is a s ecification.

his invention relates to apparatus for the generation and application of hydraulic pressure.

The principles of the self-contained hydraulic ack are well known, such device being adapted for inter osition between a suitable abutment and t e work or load and including within itself both pump and ram. It not infrequentl happens that the pressure must be a p' d at points where it is inconvenient, i not impossible, to perform the pumping operation, which makes it necessary to separate the cylinder and ram from the pum providing suitable connecting conduits therebetween for the transmission of the liquid. Under such circumstances it is possible, of course,-to locate the necessary pump valves in the ump member itself, or, as shown and descrl d In my cogending application filed October 29, 1907,

er. No. 399,740, to locate these valves and the means for their manual control in or contiguous to the ram chamber. The former constructlon 18 subject, under some conditions, to certain disadvantages not present.

in the latter, which enables the operator at the ram, who is in position to note the pro ress and eflect of the work, to control bot the generation and the application of the pressure although the pumping o eration may be continuous, and, therefore, e inate the necessity of easily-misunderstood signals from the operator at the ram to the operator at the pump. Still other conditions, however, render it at times desirable to separate the pressure-controlling means from both the pump and the ram, which may be located at some distance from each other. For instance, it is sometimes desirable to simultaneously apply the generated pressure at two diiferent points, necessitating the employment of two rams which may themselves be located at some little distance from each other. In such case, it would be manifestly inconvenient, if not under some conditions im ssible, to attempt to satisfactorily control the effect of the pumping operation and the relief mechanism from either of the ram members or from the pump.

The general'object of the present invent1on 1 s to provide what may be termed an 1nd1v1dual valve chamber, to which a suitable conduit may lead from the pump, and from which .a slmilar conduit or conduits may lead to the pressure chamber or chambers underneath the ram or rams.

My invention and its application will be more rcad1ly understood bfy reference to the accompanying drawings, orming a part of thlsspeclfication, in which- Flgure 1 is a diagraxmnatic view of a complete aplparatus embodying my invention, pne of t e ram members being shown partly 1n sectlon; Fig. 2 is an enlarged plan view of the individual valve member, and Fig. 3 is a longitudinal central section thereof.

Referring now to the drawin s in detail, numeral 11 refers to an hydrau' pressure pum having the usual pump lever 12, and whic for the pu oses of the present invention, is of the song episton type. It Ina be desired to apply the pressure generated by this pump at one point, in which case there would be necessity for a single ram only. In the present case, however, I have illus trated an apparatus designed to apply an equal pressure at each of two different points,

neoessltating the employment of the two ram members 13 and 14, which for such'purpose are identical in size and construction.

Interposed between the pump and the two rams is the member 15, designed to provide a container for all of the necessa valves of the apparatus and the means for this manual contro. This member 15 preferably comprises an integral body of suitable metal which is bored to rovide a chamber 16 interiorly threaded or the reception of the screw-plug 17 which seals said chamber. From this chamber 16 leads the longitudinal valve-bore 18, the other end of which is sealed by means of the screw lug 19,

The bore 18 is provided wit a seat 20 for the valve 21, which has a stem 22 projecting upwardly into the chamber 16. This bore 18 is similarly provided with a seat 23 for the valve 24, the latter having a stem 25 which, when said valves are seated, extends nearly but not quite to the valve 21. The valve 24 is preferably springseated, as shown, and in case the valve bore 18 is increased in diameter to provide the seat 20 for the valve 21, as shown, I prefer to provide a removable eter of said 26 to again reduce the diamc lindrical lu y g and provide the seat for the ore valve 24.

Leadin from the bore 18 at a oint intermediate tie valves 21 and 24, is t e duct 27, 0 en through the coupling 28 to the pipe 29 w iich leads to the pump-chamber underneath the piston in the pump From the end of the bore 18 opposite leads the duct 30 which at 31 is divided, one branch thereof leading through the connection 32 to the pipe 33 which connects with the pressure chamber in the ram member 14, and the other branch leading through the connection 34, to the pipe 35 and thence to the pressure chamber 36 in the ram member 13.

The valve member 15 is provided with an aperture leading to the chamber 16, in which is suitably secured the plug or mpple 37' for the reception of one end of the rubber or other suitably flexible tube or hose leading from a source of liquid supply.

The plug 17 is provi ed with the short shaft 38 carrying at its inner end, within the chamber 16, the cam 39, which is located in coo erative positional relation to the up or on of the valve stem 22. The outer en of the shaft 38 is provided with a head 40 suitably recessed for the reception of the bearing portion 41 of the lever 42 which is ivote therein. It will now be ap arent t at by means of the lever 42 the sl iaft 38 may be rotated to operate the cam 39, which, in its various positions of rotation, may be made to effect first, the unseating of the valve 21 and, thereiore, the rendering ineffective of continued o erations of the pum or, second,

continue movement of the va ve 21 until it impinges against the stem 25 and unseats the va ve 24, whereupon an open passage is provided from both pressure chambers in the rams back to the source of liquid supply, thereby relieving the pressure and effecting the lowering or contraction of the ram members for removal or readjustment of the arts.

The pipes 29, 33 and '35 are prefera ly of copper and, therefore, to a certain extent flexible. This being the case, it will be seen that the pump 11 may be located at any convenient and easily accessible point, and the rams 13 and 14 be properly adjusted to the work at some distance from the pump and, possibly, even out of sight of the operator of the pump. The inte osed valve member 15 should be convenient y located as near both of the rams as possible or practical, whereby the operator stationed at said valve member will be inposition to note the progress and effect of the work.

It will be apparent that should it become desirable to tem orarily check the application of increase pressure, the workman at the valve member will rotate the lever 42 through an arc sufficient to efiect the unseatthe chamber 16,.

in of the valve 21' without action upon the va ve 24. The, umping operation may now be continued giiit no more hquid will be forced into the ram chambers, as with said valve 21 open it will simpl pass back and forth between the ump c amber and the source of supply. 0 again make the pumping operations effective, the lever 42 is returned to its original position, whereupon the action of the valve 21 again becomes autogiatic and liquid is forced into the ram chamers.

When the work has been done, and it is desired to remove or read'ust' the rams, the I lever 42 may be rotate through an additional arc to efiect, in the manner hereinbefore described, the successive unseating of both of the valves 21 and 24, whereupon, even should the umping operations be continued, the weigl t of the rams will force the liquid from their respective ram chambers back to the source of suppl It will be noted that only the com aratively short pipes 33 and 35 will besu ject to continuous pressure, the longer pipe 29 being subject to pressure only during the effective stroke of the iston in the pump 11.

It is well known that orig-continued periods during which a copper pipe is sub'ected to ressure ultimately effect the bar ening or tempering of the metal, and in order to preserve or restore the desirable flexibility, frequent annealing is necessary. In view of the exceedingly short periods of time during which the lon er pipe 29 is subject to pressure, the usefu life of this pipe is lengthened and only the shorter pipes 33 and 25 will be subject to frequent annealing or replacement.

As hereinbefore suggested, while I have shown and described an independent valve chamber adapted to direct the liquid under pressure to each of the two ram chambers, the present invention is equally adapted ;to

. control the operation of a single ram.

Many other modifications of minor details of my improved pressure controlling means for hydraulic umps will doubtless readily suggest themse to which it appertains, and I therefore do not desire to limit .my invention to the specific construction and arrangement herein shown and described.

ves to those skilled in the art I'claim as new and desire to procure by Letters Patent:

1. In combination, means for generating hydraulic pressure, a plurality of devices apart therefrom for applying said pressure, and means apart from a ofsaid elements for controlling the effect of operation of said gineratin means and for equalizing and allp re 'eving the applied ressures. 2. n combination, means or generating hydraulic pressure, a. pluralityof devices said pressure,

apart therefrom for .applfiingf d 1 o sai e ements and means apart from a 3. In combination, means for generating hydraulic pressure, a plurality of devicesv and having apart therefrom for applfiing said pressure, and means 9. art from a ofsaid elements exible connection with each thereof for controlling the effect of operation of said eneratin means and'for equalizing and fina y relieving the applied pressures.

4. In combination, a pump, means apart therefrom for apply' 1 5 generated pressure, located in a member and said a aving flexib e and requisite va ves a interposed between said pum plying means, said mem er connection with said pump.

5. In combination, a pump, means apart therefrom for applyin theenerated pressure, and requisite va ves a located in a member interposed between said pump and said applying means and having flexible connectlons with each thereof.

6. In combination, a pump, means apart therefrom for a plyin generated pressure, and requisite val ves 9. located in a member interposed between said pum and applying means, said member havin exible connection with said pum and bemg provided with means for manua y controlling said valves.

7. In "combination, a pump, means apart therefrom for ap lying1 the generated pressure, requisite va ves a located in a member interposed between and having flexible con- 'nections with said ump and said appl ing means, and means or manually contro ing said valves.

8. In combination, a pump, means for applying the pressure generated thereby at aplu- {a ity of se ecti've points, requisite valves all coated in a member interposed between and I having flexible connections with said pump -and said applying means, and means for manually controlling said valves.

9. In combination, a pump, a ram-cylinder and ram, a flexible connecting conduit therebetween, and a member located intermediate the ends of said conduit in which is located the pump and pressure valves.

10. In combination, a pum a conduit leading therefrom having branc es to a plurality of rams, and a member at the union of said branches containing the pump valves and means for their manual control. I

11. In combination a pum a conduit leading therefrom having branc es to a plurality of rams, and a member at the union of said branches into which the liquid is directed from the source of supply and which contains all valves and means for their manual control.

13. In combination, a pum a conduit leading therefrom having bran'c es to a plurality of rams, and a member at the union of said branches into which the liquid is directed from the source of supply and which contains. all valves and means for positively unseating one or all thereof.

14. In combination, a pump, aflexible conduitleading therefrom having branches to a plurality of rams, and a member at the union of'said branches into which the liquid is directed from the source of supply, said member containing the pump valves and being rovided with means for unseating one of sai valves or all thereof.

15. In combination, a pump, a ram, and a container for the pump an'd pressure valves, each of said members being independently movable with respect to the others.

16. In combination, a pum a plurality o rams, aflexible conduit from t e pump chamvber and to each ram chamber, said conduits uniting in an individually-movable fitting, requisite pump and pressure valves in said fitting, and means for controlling said valves to render operation of said pump ineffective.

, 17. In combination, a pum a plurality of rams, a flexible conduit from t e pump chamber and to each ram chamber, said conduits uniting in an individually-movable fitting, requisite pump and pressure valves in said fitting, and means for controlling said valves to render operation of said pump inefi'ective find to relieve the pressure in the ram chamers- 18. In combination, a pum a plurality of rams, a flexible conduit from t e pump chamber and to each ram chamber, said conduits uniting in an individually-movable fitting, requisite pump and pressure valves in said fitting, and means for unseating one of said valves, said means being further operable to unseat all ofsaidvalves.

In testimony of the foregoing, I have hereunto set my hand in the presence of two witnesses.

JAMES W. NELSON. Witnesses:

JasMoonn, HELEN CROOKER. 

